Specifications:

• Up to 22Hrs Warmth & Quick Charge:With a large 1*4000mAh battery capacity, the electric hand warmer provides you with up to 22 hours of warmth during cold weather. Plus, it can be quickly fully charged in just 3.5 hours, always ready to satisfy your whole day warmth needs.
• Next-gen AI Smart Chip:WITHOUSE rechargeable hand warmers utilize a next-generation AI temperature control chip, providing precise control of heat release. By monitoring the temperature between the hand warmer and your hands in real-time, it achieves optimal comfort and safe heating.
• Trusted Safety and Quality: Equipped with 6 safety protection technologies, it has passed nearly 100 safety tests. Precise temperature control system and more advanced safety features to give you peace of mind when using it.
• 3 Levels Efficient Heating:Our hand-warmers feature 3 temperature levels -- Maximum 131℉ to meet your different heating needs in various scenarios. In addition, the latest high thermal conductivity aluminum alloy ensures swift and precise heat conduction, warming your fingers in just 2 seconds.

4000mAh Hand Warmers Rechargeable 1 Pack, AI Smart Chip 22Hrs Long Safe Heat, Quick Charge Electric Portable Pocket Heater, Warm Gifts for Christmas, Outdoor, Golf, Hunting, Camping Accessories